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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a0b70800ea1f49d90e983d13d7d8c7825006ede0cb688d5d49b713f235270a' 
  AND token = 'N8z7NQiEu5uSrgz1tJ9w7QaSXZ6rU9tPvesloERo8uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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