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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbf5f23c1ac90d0589e2f9bf6ab113843c2268c815fa69ac1f223aff80eb44c' 
  AND token = 'fpEiJPlgHufFpjLfeE4+mMktJ2TxWhKkH3hojcfQaIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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