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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aeb751440eb136ab195cbd176367515d6218803c3924ad08068c77d48f69445' 
  AND token = 'jAPJNmkc6B4FRTuESR68ae8fb5D/INUSsUXoKT4ML64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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