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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6be155abf7c53cc0c4c25ee420e934987a146d9abb50d6bbd734f2562eb6af2' 
  AND token = 'tW760ZhaK7taCjCeeIE6X+TOEFEf0i+Rl2DIW0RGhWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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