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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580dec83e5496c18bcd04dddc95439b42a974ca3e3a9cf88dca3941c398910ad' 
  AND token = 'XgYaPK+sins119IMV3XUJ8PKmZrDP5lFkbgbAySshtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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