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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278a6efd6321d254f11ae6a7a6caa093b6f05bcc4721dc8b514c23c2b121bde6' 
  AND token = 'ZiYr1uvxou36bETkNJqjHqNvgboTATzl5fzJdQEaJ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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