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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c296f68ce0660fb9d39cb3c4e03b9f59f40bd4f747e39d0200969c2dc23bc8d' 
  AND token = 'GnnD8q75qU0D7FFnvsPVMU0sTL1phG5QmomPha1lBD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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