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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ea3ba46a8a14d0a3055a22f6816d64f421a72a1670328db45e82b49f87a8fa' 
  AND token = 'CPzvUJyGN+zbsI2Mp2LMGQ3IMBOtwbCBO+qzV2+1+88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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