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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3254b549e59fdc8ed1b4d3d7bd3950699005199bed2b5b0d5015161d8f7152f' 
  AND token = 'vAsSs4f1mj5HSuwrploCi0a45KTFbIcOfWQUA+Quv1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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