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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa904b8613e521a8e08e2e6897b942e86803c175a4eab121d5669fd3575e44d0' 
  AND token = 'qagn20OD1hbucqfLSp+1ehep/Oy3Ma0Yx+NH/RO0eDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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