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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e98a1ddb5b7fbe948b8dea577a16bf12ff477cac118f84aa819098e2f910eb' 
  AND token = '2pOIQuFZYJeeLNun/q8X5/vj6DSE1YUMJz2CuxxMI80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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