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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aba2aa3aa593ffe176f48b07f4c2ccfb19916c3a963f143a22815b187dcd8ac' 
  AND token = 'E12pmKEGetU+hC5RLv5IuH7suIBHZfDTmQOsen68+Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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