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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef985cb9a7982c2110f2e4604dc38f1566d83c56d8ff2957d358bf38bb3c5719' 
  AND token = 'Nuam0bIbbNa8A77yeqmTGDPfR4lkjph1r6yGUjdcPGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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