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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36740781fb9a1f6c6350cc8985190179b5a1be506ed3027c24649beb2e7e34b8' 
  AND token = 'Gp4rmCW61UDCYzwLmiSON1OyRIPqtzYHi9TUp9BYMQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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