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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b93d177fd0440bb186d4536ddc35590cba9c74e85bc934c63b81232888848a' 
  AND token = 'ubu2y96zxN8kCnjHF1XwEm9UKaW9aJTHDRv/cdceDwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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