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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7d03d57e095e65f9484f55a5f7221b3b915ce3bf5db5b1887ace46af78c326' 
  AND token = 'AYWf8bX25sWjSlwhcIIBVOdt43Z5AK0ZKYznRsKywdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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