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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b58e8f71ffba90f151baf0721c651fa5b6ab162c3da4631184b6f6edfbe8a93' 
  AND token = '6j3w12C4N8e07dRuRI0u0eXJN3OwKekiMTaikrjAJ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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