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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9964597ef83346f5c9206442355d64a0f01d4d82453490dec4b809aad3dd418' 
  AND token = 'aS5g6g9oVDGoxtotD+qnJPy8x25ca/v1DSjkMYlCkQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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