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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d72b8f9b2a4a38393bfa625849ea97d6a8240669fa9e33dca3ac2fa35ae3452' 
  AND token = '0s2+ADGx3CL7CQ42cGL2G4l4Gx4a0SC+KRljki7UuMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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