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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc921aa8b7ed0af7081779c79e028253d6775a3dd2e4bdd3772d7f395935b3a' 
  AND token = '/O48KS54J0wunqPZtk1FdYkdD1v588ZVPh/3cCJH1yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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