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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12871e5eb997ffd94962c155e6c50b3216abcff49621c74b108756653ab4a931' 
  AND token = '/zdtbJQhOOAqcLZEOaCRWgpQCde5pCsPWplI/W6ddTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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