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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3f55b0fe3af658672d57abe11045fba911a970402502d9170e1207cf56669c' 
  AND token = 'IGXzKWvmX89wM9l2/CtdcwG4W1ffeJ7Pa/wDclEKwNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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