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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f66ae256784229260514aceaaaeefa1ee5ebb87f0b2a0dd4f0de6940ef52a96' 
  AND token = '1KPvPz7Gjy/QFrpiDqjAYHw1meT55QvdYqJj0Bo+3zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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