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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b4bdb62bd598f1975a39e390a4084bc567ca244b3bb007fde613a01797bc5c' 
  AND token = 'SPQMUUmfpwP1/kREsLeUAl8ubht/NkEc5lE2JXAfqjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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