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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dcf920d15eb5fc74aed3923141424913f3580c356115a8cfbea6713a764092' 
  AND token = 'T0HxC6IhjNj+XnyrBBFnb31O8NUbe1o9kkl+ULjeYkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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