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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e5ffab48542dd5cbff2b915e4f8e806df74dac06529b0b94b026ad96b7a9a3' 
  AND token = 'ylsgyv2N4m+//qpaUlVyH69t/XFCKrwxjHyEH6EGxMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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