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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004931c8a202a60b773aca0efeb52d365adacc713dd6a853eddf86f20a039f7f' 
  AND token = 'RgNrqp8hDpSAseCH8sG7Q7OpvLONGan2hRsYe0hI8W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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