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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a100c02f14136b9f95276cce26321fb7d97d0138bf5b527ff3fea9af4b714d34' 
  AND token = 'FAwmvLtv0qB1aI8pFrnOUgIp85biL7ElFSU3qCMtrho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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