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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3963a494913bf5519c0b2da6fafdc3392586e2aedc1773e19512eaed498e55' 
  AND token = 'MHjhYmuut/wQX9tVIhFQGpCUc1zYemjtw7Z2YfQ55hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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