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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49d3012e6b30bcc06f138ea312c8ac4a7f3fdb0f9e9bdda93d3be1dc41a080d' 
  AND token = 'QonVc5Oy/Z+3MG4NJyjt1Hddio+hsmZaeJtfuM86qw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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