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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bde7e13c5b10588c1884c434cd9ca0df3e4173c3c59607ccd3f12fa2e24ca1' 
  AND token = 'qZrggay6a6avD3dmfCC+NxyNKmZtukw/P62MHXdDV0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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