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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f53c6111b19a7471ce05ae630afbd9ef25e46270fed70c3ad8aeab68c4f83d' 
  AND token = 'ws0OCtRSnvZuBrrELqYMGHuL3UL4qISKlM52iv4DkNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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