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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ee0bae30bf302a91f4f8a65fe7429bfa11108b92b2f114b46af9e2f32e4106' 
  AND token = 'jfuwyiun/ZAy47hdcTjxSY6qyGpRnsw0Wyr3WiFyNIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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