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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9492d9a53b2c6b5516d88837f920249b3e728b159dcb8e87245c0b7523c8410b' 
  AND token = 'O6h3pHUV7bYghbIi05Ub41UWll1f7gnJBJah5VNsHM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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