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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe45ad2cbb3c321c8d19a024612abd35847328965a7d0031708347754cbb8820' 
  AND token = 'OJlKj2hheCHWA4+sFhv3mGXUyHnP19gIsI5h4byp1T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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