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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf8de30744ac84de4294437bd88b40d55bc5cf2bb0277a0541410fffab98e3e' 
  AND token = 'irMirfW3HYEzFy0yYZdE1L66E4ha7D6UiaNwLDJZ85k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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