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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40a347cbffea3fe091c2effaa401fc540e0860e87fd440a4612606941971537' 
  AND token = 'pJJOF9LfELmlTr/0Z/bHIEyVqQCH26D0udC6Py+Wf/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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