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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd243a16b4bf6810b4997ad5a6f77a3856fb0f07827cd5e3b2ea20fac816dcbf' 
  AND token = 'OlbE+aqgi5iCdwbNfmThycMJZ0QG2gEEVZd7HUBR1rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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