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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cc9a1214da9f3531d17378a7fabe70b82dc1fe91b91cf4d8e200f6cf671ae4' 
  AND token = 'x1mo6TUulsSqDakHAquzpe8CnBfIziU/ybnQt6/axyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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