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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db574a90d6365aa3e09c0bc3439992f9b7c7194f0bcb910ac45c0886c82a47d' 
  AND token = 'icixKeoo73ytRqtesI8otZ4LNocy/GwRTgqaIi9lKCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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