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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6101a6ec9002fe3b8b6e2ef9ffacd30624323b3b26f17623ab8533a2cd3bc2ff' 
  AND token = 'qd6n4X5CMZCQGUZRe60ys3RQahP4P18zZIBYlky/61c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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