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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c705353fd3c3010ae7cd37f640709c376413460204ae56b678522c2d90960' 
  AND token = 'pf0f0Z88nR5FRuO9P5n9Q7yoqAUMRQtIbGSTljsFel8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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