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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baa66e3444f99aa871dc678f1e07d930ae2e1cebf93e16d5e5ac470a0bd8878' 
  AND token = 'npYlH1LqZxS5mk6JWfGflvvnxZYvbDvQQ+K6c8IfHwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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