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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a910052e365899f7a273b7cf8bdd24ed8b86beefea7b928f334a1ff311a0ba' 
  AND token = 'Vb4eNMp6DZ12L8A6usN2aQAHV3llXsihjRu+Yw4Bruo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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