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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9845ac4c2b7b0db12cf27044f6fed7c9043184da147fd24326b4a870aaf15607' 
  AND token = 'y1RzP0oRcWJlQCywZleF6KEj6mhYWNc4m+NU5O2fO/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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