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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb111c18c2a2435c37c47658fa6b8c42d8077dafe27769b1ee099cbf5725913' 
  AND token = '1xUNcXZsls9Ca7Ga8IlMjXGi2fk30xek64BImUltjm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}