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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf06eeb96d39bdfd4b3e53c889acc7407c29af4c40c98bfebc3c9df0bf3e99e2' 
  AND token = 'LAd0sV2Z5YdA5uujfjW+bXvafBML9NfV7Jn26rGqaxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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