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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66356f85d365c5c3939eeefae57c3faf6a458f6c7946c7462924f2f18e623093' 
  AND token = 'tAE8xikUjazlbb8GOh3uXw+fnOTkUYCPzhiS1TjEr7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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