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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cc3ddcf862d92f98064cf30db6fd8195a10beac1a8622d16fbb3d6f146caeb' 
  AND token = 'k9u4g677zV7t69LTEsQ5mRCTXzJmR5ALMBsgOock3T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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