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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fdf2f93af48f5b0577421c94c460862f6208ce74681c72bb98d4004e89e8f6' 
  AND token = '0lfJbKkXhggbLN0kT5h/xqtWF9ePMwqJ1g9fLPst9kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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