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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0236e911b147e5b5be6cf13bc987660620c952c9b402af8cb55e755fbf059397' 
  AND token = 'MBT4MX3WWtGak5UVxTV8/W9WBWVQ/BYJ8Y9QB6sF+08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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