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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b93972cfb07a4b5b18f7fb5fc411523cc3d35f182be7825e37c648bb66b1016' 
  AND token = 'pRYDE7Odb7BIk0pEr2UFSc2JiN3lTc/22pz+WZD7Bog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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