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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbb1b876f1d4152b8cbdf254284338c0c109e11864393323ce096ada8c252ed' 
  AND token = 'To38rHkrmuECU89us4BAIM9C8hYVk6TRhYJVD5CBvpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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