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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98b4bdce492893999e4f593e00fe1a663bbdf15e1b38d9240f3fb2b4036f0aa' 
  AND token = 'WIilCv4N5Yq2CEJWq3xSvcRbM3vdhxhVAktycghTshc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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