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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd876e6919ddcdfdbf2018352c6b7994b60010f2bf079e8190c8fe180ca03d0cc' 
  AND token = 'KILpEA4RcXeSSGGUyq/Yj7lurSyz8Et5xfPhp+InspU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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