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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c967a78fd8cd5345b3f5cecfcefbc753ccf2c84adfaea018cc6fba32e84de934' 
  AND token = '9f9WWGEPv1nPiSthmXUD7lGZZkpGzQ36pTqzLfjDPJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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