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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6284f6390ea200b5db5297252f3384626254f3858f9cc1693afbdce465d593' 
  AND token = 'd8hmXYiCkhZF6oQvkKMLD8/rENUXzp2OgIjh4zNI29E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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