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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c33c2ed8823edcf772401e636891e2187ce8b9e5f724cdaf9034919a28d49b' 
  AND token = 'c2K9b77/nEwg1ktS3osmbSX+9fofWlnZoU3oqe4dBKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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