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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3918e7dff670ae083353b1549e222dada61123f0aadd2ea3cb02a607f9aaa670' 
  AND token = 'DpFZx7pSwFiPgztCuaOpViLMMIYPv/Qcfm5J9Qqc+zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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