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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1a5b3731f83e9d4d8cbe518fc33c911e3da1ea0645e8cf4ec178d6921ee0de' 
  AND token = '5xdVelP5Vk2ttwltcmlfzrozQvWqyF2gTzMTU5zjceY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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