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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5f7212cd6f2432f2bad4bae4c154ac5ec14cf73aa9592626b5482dd9bf5a40' 
  AND token = 'zRGQpqX/zLGah6p3Ge48s/tqED8N6pxE4vUu8cvplWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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